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Merge pull request #8817 from yuwata/cleanup-nsflags
[thirdparty/systemd.git] / src / tmpfiles / tmpfiles.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2 /***
3 This file is part of systemd.
4
5 Copyright 2010 Lennart Poettering, Kay Sievers
6 Copyright 2015 Zbigniew Jędrzejewski-Szmek
7 ***/
8
9 #include <errno.h>
10 #include <fcntl.h>
11 #include <fnmatch.h>
12 #include <getopt.h>
13 #include <glob.h>
14 #include <limits.h>
15 #include <linux/fs.h>
16 #include <stdbool.h>
17 #include <stddef.h>
18 #include <stdio.h>
19 #include <stdlib.h>
20 #include <string.h>
21 #include <sys/stat.h>
22 #include <sys/xattr.h>
23 #include <sysexits.h>
24 #include <time.h>
25 #include <unistd.h>
26
27 #include "sd-path.h"
28
29 #include "acl-util.h"
30 #include "alloc-util.h"
31 #include "btrfs-util.h"
32 #include "capability-util.h"
33 #include "chattr-util.h"
34 #include "conf-files.h"
35 #include "copy.h"
36 #include "def.h"
37 #include "dirent-util.h"
38 #include "escape.h"
39 #include "fd-util.h"
40 #include "fileio.h"
41 #include "format-util.h"
42 #include "fs-util.h"
43 #include "glob-util.h"
44 #include "io-util.h"
45 #include "label.h"
46 #include "log.h"
47 #include "macro.h"
48 #include "missing.h"
49 #include "mkdir.h"
50 #include "mount-util.h"
51 #include "parse-util.h"
52 #include "path-lookup.h"
53 #include "path-util.h"
54 #include "rm-rf.h"
55 #include "selinux-util.h"
56 #include "set.h"
57 #include "specifier.h"
58 #include "stat-util.h"
59 #include "stdio-util.h"
60 #include "string-table.h"
61 #include "string-util.h"
62 #include "strv.h"
63 #include "terminal-util.h"
64 #include "umask-util.h"
65 #include "user-util.h"
66 #include "util.h"
67
68 /* This reads all files listed in /etc/tmpfiles.d/?*.conf and creates
69 * them in the file system. This is intended to be used to create
70 * properly owned directories beneath /tmp, /var/tmp, /run, which are
71 * volatile and hence need to be recreated on bootup. */
72
73 typedef enum ItemType {
74 /* These ones take file names */
75 CREATE_FILE = 'f',
76 TRUNCATE_FILE = 'F',
77 CREATE_DIRECTORY = 'd',
78 TRUNCATE_DIRECTORY = 'D',
79 CREATE_SUBVOLUME = 'v',
80 CREATE_SUBVOLUME_INHERIT_QUOTA = 'q',
81 CREATE_SUBVOLUME_NEW_QUOTA = 'Q',
82 CREATE_FIFO = 'p',
83 CREATE_SYMLINK = 'L',
84 CREATE_CHAR_DEVICE = 'c',
85 CREATE_BLOCK_DEVICE = 'b',
86 COPY_FILES = 'C',
87
88 /* These ones take globs */
89 WRITE_FILE = 'w',
90 EMPTY_DIRECTORY = 'e',
91 SET_XATTR = 't',
92 RECURSIVE_SET_XATTR = 'T',
93 SET_ACL = 'a',
94 RECURSIVE_SET_ACL = 'A',
95 SET_ATTRIBUTE = 'h',
96 RECURSIVE_SET_ATTRIBUTE = 'H',
97 IGNORE_PATH = 'x',
98 IGNORE_DIRECTORY_PATH = 'X',
99 REMOVE_PATH = 'r',
100 RECURSIVE_REMOVE_PATH = 'R',
101 RELABEL_PATH = 'z',
102 RECURSIVE_RELABEL_PATH = 'Z',
103 ADJUST_MODE = 'm', /* legacy, 'z' is identical to this */
104 } ItemType;
105
106 typedef struct Item {
107 ItemType type;
108
109 char *path;
110 char *argument;
111 char **xattrs;
112 #if HAVE_ACL
113 acl_t acl_access;
114 acl_t acl_default;
115 #endif
116 uid_t uid;
117 gid_t gid;
118 mode_t mode;
119 usec_t age;
120
121 dev_t major_minor;
122 unsigned attribute_value;
123 unsigned attribute_mask;
124
125 bool uid_set:1;
126 bool gid_set:1;
127 bool mode_set:1;
128 bool age_set:1;
129 bool mask_perms:1;
130 bool attribute_set:1;
131
132 bool keep_first_level:1;
133
134 bool force:1;
135
136 bool done:1;
137 } Item;
138
139 typedef struct ItemArray {
140 Item *items;
141 size_t count;
142 size_t size;
143 } ItemArray;
144
145 typedef enum DirectoryType {
146 DIRECTORY_RUNTIME = 0,
147 DIRECTORY_STATE,
148 DIRECTORY_CACHE,
149 DIRECTORY_LOGS,
150 _DIRECTORY_TYPE_MAX,
151 } DirectoryType;
152
153 static bool arg_cat_config = false;
154 static bool arg_user = false;
155 static bool arg_create = false;
156 static bool arg_clean = false;
157 static bool arg_remove = false;
158 static bool arg_boot = false;
159
160 static char **arg_include_prefixes = NULL;
161 static char **arg_exclude_prefixes = NULL;
162 static char *arg_root = NULL;
163 static char *arg_replace = NULL;
164
165 #define MAX_DEPTH 256
166
167 static OrderedHashmap *items = NULL, *globs = NULL;
168 static Set *unix_sockets = NULL;
169
170 static int specifier_machine_id_safe(char specifier, void *data, void *userdata, char **ret);
171 static int specifier_directory(char specifier, void *data, void *userdata, char **ret);
172
173 static const Specifier specifier_table[] = {
174 { 'm', specifier_machine_id_safe, NULL },
175 { 'b', specifier_boot_id, NULL },
176 { 'H', specifier_host_name, NULL },
177 { 'v', specifier_kernel_release, NULL },
178
179 { 'U', specifier_user_id, NULL },
180 { 'u', specifier_user_name, NULL },
181 { 'h', specifier_user_home, NULL },
182 { 't', specifier_directory, UINT_TO_PTR(DIRECTORY_RUNTIME) },
183 { 'S', specifier_directory, UINT_TO_PTR(DIRECTORY_STATE) },
184 { 'C', specifier_directory, UINT_TO_PTR(DIRECTORY_CACHE) },
185 { 'L', specifier_directory, UINT_TO_PTR(DIRECTORY_LOGS) },
186 {}
187 };
188
189 static int specifier_machine_id_safe(char specifier, void *data, void *userdata, char **ret) {
190 int r;
191
192 /* If /etc/machine_id is missing or empty (e.g. in a chroot environment)
193 * return a recognizable error so that the caller can skip the rule
194 * gracefully. */
195
196 r = specifier_machine_id(specifier, data, userdata, ret);
197 if (IN_SET(r, -ENOENT, -ENOMEDIUM))
198 return -ENXIO;
199
200 return r;
201 }
202
203 static int specifier_directory(char specifier, void *data, void *userdata, char **ret) {
204 struct table_entry {
205 uint64_t type;
206 const char *suffix;
207 };
208
209 static const struct table_entry paths_system[] = {
210 [DIRECTORY_RUNTIME] = { SD_PATH_SYSTEM_RUNTIME },
211 [DIRECTORY_STATE] = { SD_PATH_SYSTEM_STATE_PRIVATE },
212 [DIRECTORY_CACHE] = { SD_PATH_SYSTEM_STATE_CACHE },
213 [DIRECTORY_LOGS] = { SD_PATH_SYSTEM_STATE_LOGS },
214 };
215
216 static const struct table_entry paths_user[] = {
217 [DIRECTORY_RUNTIME] = { SD_PATH_USER_RUNTIME },
218 [DIRECTORY_STATE] = { SD_PATH_USER_CONFIGURATION },
219 [DIRECTORY_CACHE] = { SD_PATH_USER_STATE_CACHE },
220 [DIRECTORY_LOGS] = { SD_PATH_USER_CONFIGURATION, "log" },
221 };
222
223 unsigned i;
224 const struct table_entry *paths;
225
226 assert_cc(ELEMENTSOF(paths_system) == ELEMENTSOF(paths_user));
227 paths = arg_user ? paths_user : paths_system;
228
229 i = PTR_TO_UINT(data);
230 assert(i < ELEMENTSOF(paths_system));
231
232 return sd_path_home(paths[i].type, paths[i].suffix, ret);
233 }
234
235 static int log_unresolvable_specifier(const char *filename, unsigned line) {
236 static bool notified = false;
237
238 /* In system mode, this is called when /etc is not fully initialized (e.g.
239 * in a chroot environment) where some specifiers are unresolvable. In user
240 * mode, this is called when some variables are not defined. These cases are
241 * not considered as an error so log at LOG_NOTICE only for the first time
242 * and then downgrade this to LOG_DEBUG for the rest. */
243
244 log_full(notified ? LOG_DEBUG : LOG_NOTICE,
245 "[%s:%u] Failed to resolve specifier: %s, skipping",
246 filename, line,
247 arg_user ? "Required $XDG_... variable not defined" : "uninitialized /etc detected");
248
249 if (!notified)
250 log_notice("All rules containing unresolvable specifiers will be skipped.");
251
252 notified = true;
253 return 0;
254 }
255
256 static int user_config_paths(char*** ret) {
257 _cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
258 _cleanup_free_ char *persistent_config = NULL, *runtime_config = NULL, *data_home = NULL;
259 _cleanup_strv_free_ char **res = NULL;
260 int r;
261
262 r = xdg_user_dirs(&config_dirs, &data_dirs);
263 if (r < 0)
264 return r;
265
266 r = xdg_user_config_dir(&persistent_config, "/user-tmpfiles.d");
267 if (r < 0 && r != -ENXIO)
268 return r;
269
270 r = xdg_user_runtime_dir(&runtime_config, "/user-tmpfiles.d");
271 if (r < 0 && r != -ENXIO)
272 return r;
273
274 r = xdg_user_data_dir(&data_home, "/user-tmpfiles.d");
275 if (r < 0 && r != -ENXIO)
276 return r;
277
278 r = strv_extend_strv_concat(&res, config_dirs, "/user-tmpfiles.d");
279 if (r < 0)
280 return r;
281
282 r = strv_extend(&res, persistent_config);
283 if (r < 0)
284 return r;
285
286 r = strv_extend(&res, runtime_config);
287 if (r < 0)
288 return r;
289
290 r = strv_extend(&res, data_home);
291 if (r < 0)
292 return r;
293
294 r = strv_extend_strv_concat(&res, data_dirs, "/user-tmpfiles.d");
295 if (r < 0)
296 return r;
297
298 r = path_strv_make_absolute_cwd(res);
299 if (r < 0)
300 return r;
301
302 *ret = TAKE_PTR(res);
303 return 0;
304 }
305
306 static bool needs_glob(ItemType t) {
307 return IN_SET(t,
308 WRITE_FILE,
309 IGNORE_PATH,
310 IGNORE_DIRECTORY_PATH,
311 REMOVE_PATH,
312 RECURSIVE_REMOVE_PATH,
313 EMPTY_DIRECTORY,
314 ADJUST_MODE,
315 RELABEL_PATH,
316 RECURSIVE_RELABEL_PATH,
317 SET_XATTR,
318 RECURSIVE_SET_XATTR,
319 SET_ACL,
320 RECURSIVE_SET_ACL,
321 SET_ATTRIBUTE,
322 RECURSIVE_SET_ATTRIBUTE);
323 }
324
325 static bool takes_ownership(ItemType t) {
326 return IN_SET(t,
327 CREATE_FILE,
328 TRUNCATE_FILE,
329 CREATE_DIRECTORY,
330 EMPTY_DIRECTORY,
331 TRUNCATE_DIRECTORY,
332 CREATE_SUBVOLUME,
333 CREATE_SUBVOLUME_INHERIT_QUOTA,
334 CREATE_SUBVOLUME_NEW_QUOTA,
335 CREATE_FIFO,
336 CREATE_SYMLINK,
337 CREATE_CHAR_DEVICE,
338 CREATE_BLOCK_DEVICE,
339 COPY_FILES,
340 WRITE_FILE,
341 IGNORE_PATH,
342 IGNORE_DIRECTORY_PATH,
343 REMOVE_PATH,
344 RECURSIVE_REMOVE_PATH);
345 }
346
347 static struct Item* find_glob(OrderedHashmap *h, const char *match) {
348 ItemArray *j;
349 Iterator i;
350
351 ORDERED_HASHMAP_FOREACH(j, h, i) {
352 unsigned n;
353
354 for (n = 0; n < j->count; n++) {
355 Item *item = j->items + n;
356
357 if (fnmatch(item->path, match, FNM_PATHNAME|FNM_PERIOD) == 0)
358 return item;
359 }
360 }
361
362 return NULL;
363 }
364
365 static void load_unix_sockets(void) {
366 _cleanup_fclose_ FILE *f = NULL;
367 int r;
368
369 if (unix_sockets)
370 return;
371
372 /* We maintain a cache of the sockets we found in /proc/net/unix to speed things up a little. */
373
374 unix_sockets = set_new(&path_hash_ops);
375 if (!unix_sockets) {
376 log_oom();
377 return;
378 }
379
380 f = fopen("/proc/net/unix", "re");
381 if (!f) {
382 log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno,
383 "Failed to open /proc/net/unix, ignoring: %m");
384 goto fail;
385 }
386
387 /* Skip header */
388 r = read_line(f, LONG_LINE_MAX, NULL);
389 if (r < 0) {
390 log_warning_errno(r, "Failed to skip /proc/net/unix header line: %m");
391 goto fail;
392 }
393 if (r == 0) {
394 log_warning("Premature end of file reading /proc/net/unix.");
395 goto fail;
396 }
397
398 for (;;) {
399 _cleanup_free_ char *line = NULL;
400 char *p, *s;
401
402 r = read_line(f, LONG_LINE_MAX, &line);
403 if (r < 0) {
404 log_warning_errno(r, "Failed to read /proc/net/unix line, ignoring: %m");
405 goto fail;
406 }
407 if (r == 0) /* EOF */
408 break;
409
410 p = strchr(line, ':');
411 if (!p)
412 continue;
413
414 if (strlen(p) < 37)
415 continue;
416
417 p += 37;
418 p += strspn(p, WHITESPACE);
419 p += strcspn(p, WHITESPACE); /* skip one more word */
420 p += strspn(p, WHITESPACE);
421
422 if (*p != '/')
423 continue;
424
425 s = strdup(p);
426 if (!s) {
427 log_oom();
428 goto fail;
429 }
430
431 path_kill_slashes(s);
432
433 r = set_consume(unix_sockets, s);
434 if (r < 0 && r != -EEXIST) {
435 log_warning_errno(r, "Failed to add AF_UNIX socket to set, ignoring: %m");
436 goto fail;
437 }
438 }
439
440 return;
441
442 fail:
443 unix_sockets = set_free_free(unix_sockets);
444 }
445
446 static bool unix_socket_alive(const char *fn) {
447 assert(fn);
448
449 load_unix_sockets();
450
451 if (unix_sockets)
452 return !!set_get(unix_sockets, (char*) fn);
453
454 /* We don't know, so assume yes */
455 return true;
456 }
457
458 static int dir_is_mount_point(DIR *d, const char *subdir) {
459
460 int mount_id_parent, mount_id;
461 int r_p, r;
462
463 r_p = name_to_handle_at_loop(dirfd(d), ".", NULL, &mount_id_parent, 0);
464 if (r_p < 0)
465 r_p = -errno;
466
467 r = name_to_handle_at_loop(dirfd(d), subdir, NULL, &mount_id, 0);
468 if (r < 0)
469 r = -errno;
470
471 /* got no handle; make no assumptions, return error */
472 if (r_p < 0 && r < 0)
473 return r_p;
474
475 /* got both handles; if they differ, it is a mount point */
476 if (r_p >= 0 && r >= 0)
477 return mount_id_parent != mount_id;
478
479 /* got only one handle; assume different mount points if one
480 * of both queries was not supported by the filesystem */
481 if (IN_SET(r_p, -ENOSYS, -EOPNOTSUPP) || IN_SET(r, -ENOSYS, -EOPNOTSUPP))
482 return true;
483
484 /* return error */
485 if (r_p < 0)
486 return r_p;
487 return r;
488 }
489
490 static DIR* xopendirat_nomod(int dirfd, const char *path) {
491 DIR *dir;
492
493 dir = xopendirat(dirfd, path, O_NOFOLLOW|O_NOATIME);
494 if (dir)
495 return dir;
496
497 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
498 if (errno != EPERM)
499 return NULL;
500
501 dir = xopendirat(dirfd, path, O_NOFOLLOW);
502 if (!dir)
503 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
504
505 return dir;
506 }
507
508 static DIR* opendir_nomod(const char *path) {
509 return xopendirat_nomod(AT_FDCWD, path);
510 }
511
512 static int dir_cleanup(
513 Item *i,
514 const char *p,
515 DIR *d,
516 const struct stat *ds,
517 usec_t cutoff,
518 dev_t rootdev,
519 bool mountpoint,
520 int maxdepth,
521 bool keep_this_level) {
522
523 struct dirent *dent;
524 struct timespec times[2];
525 bool deleted = false;
526 int r = 0;
527
528 FOREACH_DIRENT_ALL(dent, d, break) {
529 struct stat s;
530 usec_t age;
531 _cleanup_free_ char *sub_path = NULL;
532
533 if (dot_or_dot_dot(dent->d_name))
534 continue;
535
536 if (fstatat(dirfd(d), dent->d_name, &s, AT_SYMLINK_NOFOLLOW) < 0) {
537 if (errno == ENOENT)
538 continue;
539
540 /* FUSE, NFS mounts, SELinux might return EACCES */
541 r = log_full_errno(errno == EACCES ? LOG_DEBUG : LOG_ERR, errno,
542 "stat(%s/%s) failed: %m", p, dent->d_name);
543 continue;
544 }
545
546 /* Stay on the same filesystem */
547 if (s.st_dev != rootdev) {
548 log_debug("Ignoring \"%s/%s\": different filesystem.", p, dent->d_name);
549 continue;
550 }
551
552 /* Try to detect bind mounts of the same filesystem instance; they
553 * do not differ in device major/minors. This type of query is not
554 * supported on all kernels or filesystem types though. */
555 if (S_ISDIR(s.st_mode) && dir_is_mount_point(d, dent->d_name) > 0) {
556 log_debug("Ignoring \"%s/%s\": different mount of the same filesystem.",
557 p, dent->d_name);
558 continue;
559 }
560
561 sub_path = strjoin(p, "/", dent->d_name);
562 if (!sub_path) {
563 r = log_oom();
564 goto finish;
565 }
566
567 /* Is there an item configured for this path? */
568 if (ordered_hashmap_get(items, sub_path)) {
569 log_debug("Ignoring \"%s\": a separate entry exists.", sub_path);
570 continue;
571 }
572
573 if (find_glob(globs, sub_path)) {
574 log_debug("Ignoring \"%s\": a separate glob exists.", sub_path);
575 continue;
576 }
577
578 if (S_ISDIR(s.st_mode)) {
579
580 if (mountpoint &&
581 streq(dent->d_name, "lost+found") &&
582 s.st_uid == 0) {
583 log_debug("Ignoring \"%s\".", sub_path);
584 continue;
585 }
586
587 if (maxdepth <= 0)
588 log_warning("Reached max depth on \"%s\".", sub_path);
589 else {
590 _cleanup_closedir_ DIR *sub_dir;
591 int q;
592
593 sub_dir = xopendirat_nomod(dirfd(d), dent->d_name);
594 if (!sub_dir) {
595 if (errno != ENOENT)
596 r = log_error_errno(errno, "opendir(%s) failed: %m", sub_path);
597
598 continue;
599 }
600
601 q = dir_cleanup(i, sub_path, sub_dir, &s, cutoff, rootdev, false, maxdepth-1, false);
602 if (q < 0)
603 r = q;
604 }
605
606 /* Note: if you are wondering why we don't
607 * support the sticky bit for excluding
608 * directories from cleaning like we do it for
609 * other file system objects: well, the sticky
610 * bit already has a meaning for directories,
611 * so we don't want to overload that. */
612
613 if (keep_this_level) {
614 log_debug("Keeping \"%s\".", sub_path);
615 continue;
616 }
617
618 /* Ignore ctime, we change it when deleting */
619 age = timespec_load(&s.st_mtim);
620 if (age >= cutoff) {
621 char a[FORMAT_TIMESTAMP_MAX];
622 /* Follows spelling in stat(1). */
623 log_debug("Directory \"%s\": modify time %s is too new.",
624 sub_path,
625 format_timestamp_us(a, sizeof(a), age));
626 continue;
627 }
628
629 age = timespec_load(&s.st_atim);
630 if (age >= cutoff) {
631 char a[FORMAT_TIMESTAMP_MAX];
632 log_debug("Directory \"%s\": access time %s is too new.",
633 sub_path,
634 format_timestamp_us(a, sizeof(a), age));
635 continue;
636 }
637
638 log_debug("Removing directory \"%s\".", sub_path);
639 if (unlinkat(dirfd(d), dent->d_name, AT_REMOVEDIR) < 0)
640 if (!IN_SET(errno, ENOENT, ENOTEMPTY))
641 r = log_error_errno(errno, "rmdir(%s): %m", sub_path);
642
643 } else {
644 /* Skip files for which the sticky bit is
645 * set. These are semantics we define, and are
646 * unknown elsewhere. See XDG_RUNTIME_DIR
647 * specification for details. */
648 if (s.st_mode & S_ISVTX) {
649 log_debug("Skipping \"%s\": sticky bit set.", sub_path);
650 continue;
651 }
652
653 if (mountpoint && S_ISREG(s.st_mode))
654 if (s.st_uid == 0 && STR_IN_SET(dent->d_name,
655 ".journal",
656 "aquota.user",
657 "aquota.group")) {
658 log_debug("Skipping \"%s\".", sub_path);
659 continue;
660 }
661
662 /* Ignore sockets that are listed in /proc/net/unix */
663 if (S_ISSOCK(s.st_mode) && unix_socket_alive(sub_path)) {
664 log_debug("Skipping \"%s\": live socket.", sub_path);
665 continue;
666 }
667
668 /* Ignore device nodes */
669 if (S_ISCHR(s.st_mode) || S_ISBLK(s.st_mode)) {
670 log_debug("Skipping \"%s\": a device.", sub_path);
671 continue;
672 }
673
674 /* Keep files on this level around if this is
675 * requested */
676 if (keep_this_level) {
677 log_debug("Keeping \"%s\".", sub_path);
678 continue;
679 }
680
681 age = timespec_load(&s.st_mtim);
682 if (age >= cutoff) {
683 char a[FORMAT_TIMESTAMP_MAX];
684 /* Follows spelling in stat(1). */
685 log_debug("File \"%s\": modify time %s is too new.",
686 sub_path,
687 format_timestamp_us(a, sizeof(a), age));
688 continue;
689 }
690
691 age = timespec_load(&s.st_atim);
692 if (age >= cutoff) {
693 char a[FORMAT_TIMESTAMP_MAX];
694 log_debug("File \"%s\": access time %s is too new.",
695 sub_path,
696 format_timestamp_us(a, sizeof(a), age));
697 continue;
698 }
699
700 age = timespec_load(&s.st_ctim);
701 if (age >= cutoff) {
702 char a[FORMAT_TIMESTAMP_MAX];
703 log_debug("File \"%s\": change time %s is too new.",
704 sub_path,
705 format_timestamp_us(a, sizeof(a), age));
706 continue;
707 }
708
709 log_debug("unlink \"%s\"", sub_path);
710
711 if (unlinkat(dirfd(d), dent->d_name, 0) < 0)
712 if (errno != ENOENT)
713 r = log_error_errno(errno, "unlink(%s): %m", sub_path);
714
715 deleted = true;
716 }
717 }
718
719 finish:
720 if (deleted) {
721 usec_t age1, age2;
722 char a[FORMAT_TIMESTAMP_MAX], b[FORMAT_TIMESTAMP_MAX];
723
724 /* Restore original directory timestamps */
725 times[0] = ds->st_atim;
726 times[1] = ds->st_mtim;
727
728 age1 = timespec_load(&ds->st_atim);
729 age2 = timespec_load(&ds->st_mtim);
730 log_debug("Restoring access and modification time on \"%s\": %s, %s",
731 p,
732 format_timestamp_us(a, sizeof(a), age1),
733 format_timestamp_us(b, sizeof(b), age2));
734 if (futimens(dirfd(d), times) < 0)
735 log_error_errno(errno, "utimensat(%s): %m", p);
736 }
737
738 return r;
739 }
740
741 static bool dangerous_hardlinks(void) {
742 _cleanup_free_ char *value = NULL;
743 static int cached = -1;
744 int r;
745
746 /* Check whether the fs.protected_hardlinks sysctl is on. If we can't determine it we assume its off, as that's
747 * what the upstream default is. */
748
749 if (cached >= 0)
750 return cached;
751
752 r = read_one_line_file("/proc/sys/fs/protected_hardlinks", &value);
753 if (r < 0) {
754 log_debug_errno(r, "Failed to read fs.protected_hardlinks sysctl: %m");
755 return true;
756 }
757
758 r = parse_boolean(value);
759 if (r < 0) {
760 log_debug_errno(r, "Failed to parse fs.protected_hardlinks sysctl: %m");
761 return true;
762 }
763
764 cached = r == 0;
765 return cached;
766 }
767
768 static bool hardlink_vulnerable(const struct stat *st) {
769 assert(st);
770
771 return !S_ISDIR(st->st_mode) && st->st_nlink > 1 && dangerous_hardlinks();
772 }
773
774 static int fd_set_perms(Item *i, int fd, const struct stat *st) {
775 _cleanup_free_ char *path = NULL;
776 int r;
777
778 assert(i);
779 assert(fd);
780
781 r = fd_get_path(fd, &path);
782 if (r < 0)
783 return r;
784
785 if (!i->mode_set && !i->uid_set && !i->gid_set)
786 goto shortcut;
787
788 if (hardlink_vulnerable(st)) {
789 log_error("Refusing to set permissions on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.", path);
790 return -EPERM;
791 }
792
793 if (i->mode_set) {
794 if (S_ISLNK(st->st_mode))
795 log_debug("Skipping mode fix for symlink %s.", path);
796 else {
797 mode_t m = i->mode;
798
799 if (i->mask_perms) {
800 if (!(st->st_mode & 0111))
801 m &= ~0111;
802 if (!(st->st_mode & 0222))
803 m &= ~0222;
804 if (!(st->st_mode & 0444))
805 m &= ~0444;
806 if (!S_ISDIR(st->st_mode))
807 m &= ~07000; /* remove sticky/sgid/suid bit, unless directory */
808 }
809
810 if (m == (st->st_mode & 07777))
811 log_debug("\"%s\" has correct mode %o already.", path, st->st_mode);
812 else {
813 log_debug("Changing \"%s\" to mode %o.", path, m);
814 if (fchmod_opath(fd, m) < 0)
815 return log_error_errno(errno, "fchmod() of %s failed: %m", path);
816 }
817 }
818 }
819
820 if ((i->uid_set && i->uid != st->st_uid) ||
821 (i->gid_set && i->gid != st->st_gid)) {
822 log_debug("Changing \"%s\" to owner "UID_FMT":"GID_FMT,
823 path,
824 i->uid_set ? i->uid : UID_INVALID,
825 i->gid_set ? i->gid : GID_INVALID);
826
827 if (fchownat(fd,
828 "",
829 i->uid_set ? i->uid : UID_INVALID,
830 i->gid_set ? i->gid : GID_INVALID,
831 AT_EMPTY_PATH) < 0)
832 return log_error_errno(errno, "fchownat() of %s failed: %m", path);
833 }
834
835 shortcut:
836 return label_fix(path, 0);
837 }
838
839 static int path_set_perms(Item *i, const char *path) {
840 _cleanup_close_ int fd = -1;
841 struct stat st;
842
843 assert(i);
844 assert(path);
845
846 fd = open(path, O_NOFOLLOW|O_CLOEXEC|O_PATH);
847 if (fd < 0) {
848 int level = LOG_ERR, r = -errno;
849
850 /* Option "e" operates only on existing objects. Do not
851 * print errors about non-existent files or directories */
852 if (i->type == EMPTY_DIRECTORY && errno == ENOENT) {
853 level = LOG_DEBUG;
854 r = 0;
855 }
856
857 log_full_errno(level, errno, "Adjusting owner and mode for %s failed: %m", path);
858 return r;
859 }
860
861 if (fstat(fd, &st) < 0)
862 return log_error_errno(errno, "Failed to fstat() file %s: %m", path);
863
864 if (i->type == EMPTY_DIRECTORY && !S_ISDIR(st.st_mode))
865 return log_error_errno(EEXIST, "'%s' already exists and is not a directory. ", path);
866
867 return fd_set_perms(i, fd, &st);
868 }
869
870 static int parse_xattrs_from_arg(Item *i) {
871 const char *p;
872 int r;
873
874 assert(i);
875 assert(i->argument);
876
877 p = i->argument;
878
879 for (;;) {
880 _cleanup_free_ char *name = NULL, *value = NULL, *xattr = NULL;
881
882 r = extract_first_word(&p, &xattr, NULL, EXTRACT_QUOTES|EXTRACT_CUNESCAPE);
883 if (r < 0)
884 log_warning_errno(r, "Failed to parse extended attribute '%s', ignoring: %m", p);
885 if (r <= 0)
886 break;
887
888 r = split_pair(xattr, "=", &name, &value);
889 if (r < 0) {
890 log_warning_errno(r, "Failed to parse extended attribute, ignoring: %s", xattr);
891 continue;
892 }
893
894 if (isempty(name) || isempty(value)) {
895 log_warning("Malformed extended attribute found, ignoring: %s", xattr);
896 continue;
897 }
898
899 if (strv_push_pair(&i->xattrs, name, value) < 0)
900 return log_oom();
901
902 name = value = NULL;
903 }
904
905 return 0;
906 }
907
908 static int fd_set_xattrs(Item *i, int fd, const struct stat *st) {
909 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
910 _cleanup_free_ char *path = NULL;
911 char **name, **value;
912 int r;
913
914 assert(i);
915 assert(fd);
916
917 r = fd_get_path(fd, &path);
918 if (r < 0)
919 return r;
920
921 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
922
923 STRV_FOREACH_PAIR(name, value, i->xattrs) {
924 log_debug("Setting extended attribute '%s=%s' on %s.", *name, *value, path);
925 if (setxattr(procfs_path, *name, *value, strlen(*value), 0) < 0)
926 return log_error_errno(errno, "Setting extended attribute %s=%s on %s failed: %m",
927 *name, *value, path);
928 }
929 return 0;
930 }
931
932 static int path_set_xattrs(Item *i, const char *path) {
933 _cleanup_close_ int fd = -1;
934
935 assert(i);
936 assert(path);
937
938 fd = open(path, O_CLOEXEC|O_NOFOLLOW|O_PATH);
939 if (fd < 0)
940 return log_error_errno(errno, "Cannot open '%s': %m", path);
941
942 return fd_set_xattrs(i, fd, NULL);
943 }
944
945 static int parse_acls_from_arg(Item *item) {
946 #if HAVE_ACL
947 int r;
948
949 assert(item);
950
951 /* If force (= modify) is set, we will not modify the acl
952 * afterwards, so the mask can be added now if necessary. */
953
954 r = parse_acl(item->argument, &item->acl_access, &item->acl_default, !item->force);
955 if (r < 0)
956 log_warning_errno(r, "Failed to parse ACL \"%s\": %m. Ignoring", item->argument);
957 #else
958 log_warning_errno(ENOSYS, "ACLs are not supported. Ignoring");
959 #endif
960
961 return 0;
962 }
963
964 #if HAVE_ACL
965 static int path_set_acl(const char *path, const char *pretty, acl_type_t type, acl_t acl, bool modify) {
966 _cleanup_(acl_free_charpp) char *t = NULL;
967 _cleanup_(acl_freep) acl_t dup = NULL;
968 int r;
969
970 /* Returns 0 for success, positive error if already warned,
971 * negative error otherwise. */
972
973 if (modify) {
974 r = acls_for_file(path, type, acl, &dup);
975 if (r < 0)
976 return r;
977
978 r = calc_acl_mask_if_needed(&dup);
979 if (r < 0)
980 return r;
981 } else {
982 dup = acl_dup(acl);
983 if (!dup)
984 return -errno;
985
986 /* the mask was already added earlier if needed */
987 }
988
989 r = add_base_acls_if_needed(&dup, path);
990 if (r < 0)
991 return r;
992
993 t = acl_to_any_text(dup, NULL, ',', TEXT_ABBREVIATE);
994 log_debug("Setting %s ACL %s on %s.",
995 type == ACL_TYPE_ACCESS ? "access" : "default",
996 strna(t), pretty);
997
998 r = acl_set_file(path, type, dup);
999 if (r < 0)
1000 /* Return positive to indicate we already warned */
1001 return -log_error_errno(errno,
1002 "Setting %s ACL \"%s\" on %s failed: %m",
1003 type == ACL_TYPE_ACCESS ? "access" : "default",
1004 strna(t), pretty);
1005
1006 return 0;
1007 }
1008 #endif
1009
1010 static int fd_set_acls(Item *item, int fd, const struct stat *st) {
1011 int r = 0;
1012 #if HAVE_ACL
1013 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1014 _cleanup_free_ char *path = NULL;
1015
1016 assert(item);
1017 assert(fd);
1018 assert(st);
1019
1020 r = fd_get_path(fd, &path);
1021 if (r < 0)
1022 return r;
1023
1024 if (hardlink_vulnerable(st)) {
1025 log_error("Refusing to set ACLs on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.", path);
1026 return -EPERM;
1027 }
1028
1029 if (S_ISLNK(st->st_mode)) {
1030 log_debug("Skipping ACL fix for symlink %s.", path);
1031 return 0;
1032 }
1033
1034 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1035
1036 if (item->acl_access)
1037 r = path_set_acl(procfs_path, path, ACL_TYPE_ACCESS, item->acl_access, item->force);
1038
1039 if (r == 0 && item->acl_default)
1040 r = path_set_acl(procfs_path, path, ACL_TYPE_DEFAULT, item->acl_default, item->force);
1041
1042 if (r > 0)
1043 return -r; /* already warned */
1044 if (r == -EOPNOTSUPP) {
1045 log_debug_errno(r, "ACLs not supported by file system at %s", path);
1046 return 0;
1047 }
1048 if (r < 0)
1049 return log_error_errno(r, "ACL operation on \"%s\" failed: %m", path);
1050 #endif
1051 return r;
1052 }
1053
1054 static int path_set_acls(Item *item, const char *path) {
1055 int r = 0;
1056 #ifdef HAVE_ACL
1057 _cleanup_close_ int fd = -1;
1058 struct stat st;
1059
1060 assert(item);
1061 assert(path);
1062
1063 fd = open(path, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1064 if (fd < 0)
1065 return log_error_errno(errno, "Adjusting ACL of %s failed: %m", path);
1066
1067 if (fstat(fd, &st) < 0)
1068 return log_error_errno(errno, "Failed to fstat() file %s: %m", path);
1069
1070 r = fd_set_acls(item, fd, &st);
1071 #endif
1072 return r;
1073 }
1074
1075 #define ATTRIBUTES_ALL \
1076 (FS_NOATIME_FL | \
1077 FS_SYNC_FL | \
1078 FS_DIRSYNC_FL | \
1079 FS_APPEND_FL | \
1080 FS_COMPR_FL | \
1081 FS_NODUMP_FL | \
1082 FS_EXTENT_FL | \
1083 FS_IMMUTABLE_FL | \
1084 FS_JOURNAL_DATA_FL | \
1085 FS_SECRM_FL | \
1086 FS_UNRM_FL | \
1087 FS_NOTAIL_FL | \
1088 FS_TOPDIR_FL | \
1089 FS_NOCOW_FL)
1090
1091 static int parse_attribute_from_arg(Item *item) {
1092
1093 static const struct {
1094 char character;
1095 unsigned value;
1096 } attributes[] = {
1097 { 'A', FS_NOATIME_FL }, /* do not update atime */
1098 { 'S', FS_SYNC_FL }, /* Synchronous updates */
1099 { 'D', FS_DIRSYNC_FL }, /* dirsync behaviour (directories only) */
1100 { 'a', FS_APPEND_FL }, /* writes to file may only append */
1101 { 'c', FS_COMPR_FL }, /* Compress file */
1102 { 'd', FS_NODUMP_FL }, /* do not dump file */
1103 { 'e', FS_EXTENT_FL }, /* Extents */
1104 { 'i', FS_IMMUTABLE_FL }, /* Immutable file */
1105 { 'j', FS_JOURNAL_DATA_FL }, /* Reserved for ext3 */
1106 { 's', FS_SECRM_FL }, /* Secure deletion */
1107 { 'u', FS_UNRM_FL }, /* Undelete */
1108 { 't', FS_NOTAIL_FL }, /* file tail should not be merged */
1109 { 'T', FS_TOPDIR_FL }, /* Top of directory hierarchies */
1110 { 'C', FS_NOCOW_FL }, /* Do not cow file */
1111 };
1112
1113 enum {
1114 MODE_ADD,
1115 MODE_DEL,
1116 MODE_SET
1117 } mode = MODE_ADD;
1118
1119 unsigned value = 0, mask = 0;
1120 const char *p;
1121
1122 assert(item);
1123
1124 p = item->argument;
1125 if (p) {
1126 if (*p == '+') {
1127 mode = MODE_ADD;
1128 p++;
1129 } else if (*p == '-') {
1130 mode = MODE_DEL;
1131 p++;
1132 } else if (*p == '=') {
1133 mode = MODE_SET;
1134 p++;
1135 }
1136 }
1137
1138 if (isempty(p) && mode != MODE_SET) {
1139 log_error("Setting file attribute on '%s' needs an attribute specification.", item->path);
1140 return -EINVAL;
1141 }
1142
1143 for (; p && *p ; p++) {
1144 unsigned i, v;
1145
1146 for (i = 0; i < ELEMENTSOF(attributes); i++)
1147 if (*p == attributes[i].character)
1148 break;
1149
1150 if (i >= ELEMENTSOF(attributes)) {
1151 log_error("Unknown file attribute '%c' on '%s'.", *p, item->path);
1152 return -EINVAL;
1153 }
1154
1155 v = attributes[i].value;
1156
1157 SET_FLAG(value, v, IN_SET(mode, MODE_ADD, MODE_SET));
1158
1159 mask |= v;
1160 }
1161
1162 if (mode == MODE_SET)
1163 mask |= ATTRIBUTES_ALL;
1164
1165 assert(mask != 0);
1166
1167 item->attribute_mask = mask;
1168 item->attribute_value = value;
1169 item->attribute_set = true;
1170
1171 return 0;
1172 }
1173
1174 static int fd_set_attribute(Item *item, int fd, const struct stat *st) {
1175 _cleanup_close_ int procfs_fd = -1;
1176 _cleanup_free_ char *path = NULL;
1177 unsigned f;
1178 int r;
1179
1180 if (!item->attribute_set || item->attribute_mask == 0)
1181 return 0;
1182
1183 r = fd_get_path(fd, &path);
1184 if (r < 0)
1185 return r;
1186
1187 /* Issuing the file attribute ioctls on device nodes is not
1188 * safe, as that will be delivered to the drivers, not the
1189 * file system containing the device node. */
1190 if (!S_ISREG(st->st_mode) && !S_ISDIR(st->st_mode)) {
1191 log_error("Setting file flags is only supported on regular files and directories, cannot set on '%s'.", path);
1192 return -EINVAL;
1193 }
1194
1195 f = item->attribute_value & item->attribute_mask;
1196
1197 /* Mask away directory-specific flags */
1198 if (!S_ISDIR(st->st_mode))
1199 f &= ~FS_DIRSYNC_FL;
1200
1201 procfs_fd = fd_reopen(fd, O_RDONLY|O_CLOEXEC|O_NOATIME);
1202 if (procfs_fd < 0)
1203 return -errno;
1204
1205 r = chattr_fd(procfs_fd, f, item->attribute_mask);
1206 if (r < 0)
1207 log_full_errno(IN_SET(r, -ENOTTY, -EOPNOTSUPP) ? LOG_DEBUG : LOG_WARNING,
1208 r,
1209 "Cannot set file attribute for '%s', value=0x%08x, mask=0x%08x: %m",
1210 path, item->attribute_value, item->attribute_mask);
1211
1212 return 0;
1213 }
1214
1215 static int path_set_attribute(Item *item, const char *path) {
1216 _cleanup_close_ int fd = -1;
1217 struct stat st;
1218
1219 if (!item->attribute_set || item->attribute_mask == 0)
1220 return 0;
1221
1222 fd = open(path, O_CLOEXEC|O_NOFOLLOW|O_PATH);
1223 if (fd < 0)
1224 return log_error_errno(errno, "Cannot open '%s': %m", path);
1225
1226 if (fstat(fd, &st) < 0)
1227 return log_error_errno(errno, "Cannot stat '%s': %m", path);
1228
1229 return fd_set_attribute(item, fd, &st);
1230 }
1231
1232 static int write_one_file(Item *i, const char *path) {
1233 _cleanup_close_ int fd = -1;
1234 int flags, r = 0;
1235 struct stat st;
1236
1237 assert(i);
1238 assert(path);
1239
1240 flags = i->type == CREATE_FILE ? O_CREAT|O_EXCL|O_NOFOLLOW :
1241 i->type == TRUNCATE_FILE ? O_CREAT|O_TRUNC|O_NOFOLLOW : 0;
1242
1243 RUN_WITH_UMASK(0000) {
1244 mac_selinux_create_file_prepare(path, S_IFREG);
1245 fd = open(path, flags|O_NDELAY|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1246 mac_selinux_create_file_clear();
1247 }
1248
1249 if (fd < 0) {
1250 if (i->type == WRITE_FILE && errno == ENOENT) {
1251 log_debug_errno(errno, "Not writing missing file \"%s\": %m", path);
1252 return 0;
1253 }
1254 if (i->type == CREATE_FILE && errno == EEXIST) {
1255 log_debug_errno(errno, "Not writing to pre-existing file \"%s\": %m", path);
1256 goto done;
1257 }
1258
1259 r = -errno;
1260 if (!i->argument && errno == EROFS && stat(path, &st) == 0 &&
1261 (i->type == CREATE_FILE || st.st_size == 0))
1262 goto check_mode;
1263
1264 return log_error_errno(r, "Failed to create file %s: %m", path);
1265 }
1266
1267 if (i->argument) {
1268 log_debug("%s to \"%s\".", i->type == CREATE_FILE ? "Appending" : "Writing", path);
1269
1270 r = loop_write(fd, i->argument, strlen(i->argument), false);
1271 if (r < 0)
1272 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1273 } else
1274 log_debug("\"%s\" has been created.", path);
1275
1276 fd = safe_close(fd);
1277
1278 done:
1279 if (stat(path, &st) < 0)
1280 return log_error_errno(errno, "stat(%s) failed: %m", path);
1281
1282 check_mode:
1283 if (!S_ISREG(st.st_mode)) {
1284 log_error("%s is not a file.", path);
1285 return -EEXIST;
1286 }
1287
1288 r = path_set_perms(i, path);
1289 if (r < 0)
1290 return r;
1291
1292 return 0;
1293 }
1294
1295 typedef int (*action_t)(Item *, const char *);
1296 typedef int (*fdaction_t)(Item *, int fd, const struct stat *st);
1297
1298 static int item_do(Item *i, int fd, const struct stat *st, fdaction_t action) {
1299 int r = 0, q;
1300
1301 assert(i);
1302 assert(fd >= 0);
1303 assert(st);
1304
1305 /* This returns the first error we run into, but nevertheless
1306 * tries to go on */
1307 r = action(i, fd, st);
1308
1309 if (S_ISDIR(st->st_mode)) {
1310 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1311 _cleanup_closedir_ DIR *d = NULL;
1312 struct dirent *de;
1313
1314 /* The passed 'fd' was opened with O_PATH. We need to convert
1315 * it into a 'regular' fd before reading the directory content. */
1316 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1317
1318 d = opendir(procfs_path);
1319 if (!d) {
1320 r = r ?: -errno;
1321 goto finish;
1322 }
1323
1324 FOREACH_DIRENT_ALL(de, d, q = -errno; goto finish) {
1325 struct stat de_st;
1326 int de_fd;
1327
1328 if (dot_or_dot_dot(de->d_name))
1329 continue;
1330
1331 de_fd = openat(fd, de->d_name, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1332 if (de_fd >= 0 && fstat(de_fd, &de_st) >= 0)
1333 /* pass ownership of dirent fd over */
1334 q = item_do(i, de_fd, &de_st, action);
1335 else
1336 q = -errno;
1337
1338 if (q < 0 && r == 0)
1339 r = q;
1340 }
1341 }
1342 finish:
1343 safe_close(fd);
1344 return r;
1345 }
1346
1347 static int glob_item(Item *i, action_t action) {
1348 _cleanup_globfree_ glob_t g = {
1349 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1350 };
1351 int r = 0, k;
1352 char **fn;
1353
1354 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1355 if (k < 0 && k != -ENOENT)
1356 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1357
1358 STRV_FOREACH(fn, g.gl_pathv) {
1359 k = action(i, *fn);
1360 if (k < 0 && r == 0)
1361 r = k;
1362 }
1363
1364 return r;
1365 }
1366
1367 static int glob_item_recursively(Item *i, fdaction_t action) {
1368 _cleanup_globfree_ glob_t g = {
1369 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1370 };
1371 int r = 0, k;
1372 char **fn;
1373
1374 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1375 if (k < 0 && k != -ENOENT)
1376 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1377
1378 STRV_FOREACH(fn, g.gl_pathv) {
1379 _cleanup_close_ int fd = -1;
1380 struct stat st;
1381
1382 /* Make sure we won't trigger/follow file object (such as
1383 * device nodes, automounts, ...) pointed out by 'fn' with
1384 * O_PATH. Note, when O_PATH is used, flags other than
1385 * O_CLOEXEC, O_DIRECTORY, and O_NOFOLLOW are ignored. */
1386
1387 fd = open(*fn, O_CLOEXEC|O_NOFOLLOW|O_PATH);
1388 if (fd < 0) {
1389 r = r ?: -errno;
1390 continue;
1391 }
1392
1393 if (fstat(fd, &st) < 0) {
1394 r = r ?: -errno;
1395 continue;
1396 }
1397
1398 k = item_do(i, fd, &st, action);
1399 if (k < 0 && r == 0)
1400 r = k;
1401
1402 /* we passed fd ownership to the previous call */
1403 fd = -1;
1404 }
1405
1406 return r;
1407 }
1408
1409 typedef enum {
1410 CREATION_NORMAL,
1411 CREATION_EXISTING,
1412 CREATION_FORCE,
1413 _CREATION_MODE_MAX,
1414 _CREATION_MODE_INVALID = -1
1415 } CreationMode;
1416
1417 static const char *creation_mode_verb_table[_CREATION_MODE_MAX] = {
1418 [CREATION_NORMAL] = "Created",
1419 [CREATION_EXISTING] = "Found existing",
1420 [CREATION_FORCE] = "Created replacement",
1421 };
1422
1423 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(creation_mode_verb, CreationMode);
1424
1425 static int create_item(Item *i) {
1426 struct stat st;
1427 int r = 0;
1428 int q = 0;
1429 CreationMode creation;
1430
1431 assert(i);
1432
1433 log_debug("Running create action for entry %c %s", (char) i->type, i->path);
1434
1435 switch (i->type) {
1436
1437 case IGNORE_PATH:
1438 case IGNORE_DIRECTORY_PATH:
1439 case REMOVE_PATH:
1440 case RECURSIVE_REMOVE_PATH:
1441 return 0;
1442
1443 case CREATE_FILE:
1444 case TRUNCATE_FILE:
1445 RUN_WITH_UMASK(0000)
1446 (void) mkdir_parents_label(i->path, 0755);
1447
1448 r = write_one_file(i, i->path);
1449 if (r < 0)
1450 return r;
1451 break;
1452
1453 case COPY_FILES:
1454 RUN_WITH_UMASK(0000)
1455 (void) mkdir_parents_label(i->path, 0755);
1456
1457 log_debug("Copying tree \"%s\" to \"%s\".", i->argument, i->path);
1458 r = copy_tree(i->argument, i->path,
1459 i->uid_set ? i->uid : UID_INVALID,
1460 i->gid_set ? i->gid : GID_INVALID,
1461 COPY_REFLINK);
1462
1463 if (r == -EROFS && stat(i->path, &st) == 0)
1464 r = -EEXIST;
1465
1466 if (r < 0) {
1467 struct stat a, b;
1468
1469 if (r != -EEXIST)
1470 return log_error_errno(r, "Failed to copy files to %s: %m", i->path);
1471
1472 if (stat(i->argument, &a) < 0)
1473 return log_error_errno(errno, "stat(%s) failed: %m", i->argument);
1474
1475 if (stat(i->path, &b) < 0)
1476 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1477
1478 if ((a.st_mode ^ b.st_mode) & S_IFMT) {
1479 log_debug("Can't copy to %s, file exists already and is of different type", i->path);
1480 return 0;
1481 }
1482 }
1483
1484 r = path_set_perms(i, i->path);
1485 if (r < 0)
1486 return r;
1487
1488 break;
1489
1490 case WRITE_FILE:
1491 r = glob_item(i, write_one_file);
1492 if (r < 0)
1493 return r;
1494
1495 break;
1496
1497 case CREATE_DIRECTORY:
1498 case TRUNCATE_DIRECTORY:
1499 case CREATE_SUBVOLUME:
1500 case CREATE_SUBVOLUME_INHERIT_QUOTA:
1501 case CREATE_SUBVOLUME_NEW_QUOTA:
1502 RUN_WITH_UMASK(0000)
1503 (void) mkdir_parents_label(i->path, 0755);
1504
1505 if (IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA)) {
1506
1507 if (btrfs_is_subvol(empty_to_root(arg_root)) <= 0)
1508
1509 /* Don't create a subvolume unless the
1510 * root directory is one, too. We do
1511 * this under the assumption that if
1512 * the root directory is just a plain
1513 * directory (i.e. very light-weight),
1514 * we shouldn't try to split it up
1515 * into subvolumes (i.e. more
1516 * heavy-weight). Thus, chroot()
1517 * environments and suchlike will get
1518 * a full brtfs subvolume set up below
1519 * their tree only if they
1520 * specifically set up a btrfs
1521 * subvolume for the root dir too. */
1522
1523 r = -ENOTTY;
1524 else {
1525 RUN_WITH_UMASK((~i->mode) & 0777)
1526 r = btrfs_subvol_make(i->path);
1527 }
1528 } else
1529 r = 0;
1530
1531 if (IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY) || r == -ENOTTY)
1532 RUN_WITH_UMASK(0000)
1533 r = mkdir_label(i->path, i->mode);
1534
1535 if (r < 0) {
1536 int k;
1537
1538 if (!IN_SET(r, -EEXIST, -EROFS))
1539 return log_error_errno(r, "Failed to create directory or subvolume \"%s\": %m", i->path);
1540
1541 k = is_dir(i->path, false);
1542 if (k == -ENOENT && r == -EROFS)
1543 return log_error_errno(r, "%s does not exist and cannot be created as the file system is read-only.", i->path);
1544 if (k < 0)
1545 return log_error_errno(k, "Failed to check if %s exists: %m", i->path);
1546 if (!k) {
1547 log_warning("\"%s\" already exists and is not a directory.", i->path);
1548 return 0;
1549 }
1550
1551 creation = CREATION_EXISTING;
1552 } else
1553 creation = CREATION_NORMAL;
1554
1555 log_debug("%s directory \"%s\".", creation_mode_verb_to_string(creation), i->path);
1556
1557 if (IN_SET(i->type, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)) {
1558 r = btrfs_subvol_auto_qgroup(i->path, 0, i->type == CREATE_SUBVOLUME_NEW_QUOTA);
1559 if (r == -ENOTTY)
1560 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (unsupported fs or dir not a subvolume): %m", i->path);
1561 else if (r == -EROFS)
1562 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (fs is read-only).", i->path);
1563 else if (r == -ENOPROTOOPT)
1564 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (quota support is disabled).", i->path);
1565 else if (r < 0)
1566 q = log_error_errno(r, "Failed to adjust quota for subvolume \"%s\": %m", i->path);
1567 else if (r > 0)
1568 log_debug("Adjusted quota for subvolume \"%s\".", i->path);
1569 else if (r == 0)
1570 log_debug("Quota for subvolume \"%s\" already in place, no change made.", i->path);
1571 }
1572
1573 _fallthrough_;
1574 case EMPTY_DIRECTORY:
1575 r = glob_item(i, path_set_perms);
1576 if (q < 0)
1577 return q;
1578 if (r < 0)
1579 return r;
1580
1581 break;
1582
1583 case CREATE_FIFO:
1584 RUN_WITH_UMASK(0000) {
1585 (void) mkdir_parents_label(i->path, 0755);
1586
1587 mac_selinux_create_file_prepare(i->path, S_IFIFO);
1588 r = mkfifo(i->path, i->mode);
1589 mac_selinux_create_file_clear();
1590 }
1591
1592 if (r < 0) {
1593 if (errno != EEXIST)
1594 return log_error_errno(errno, "Failed to create fifo %s: %m", i->path);
1595
1596 if (lstat(i->path, &st) < 0)
1597 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1598
1599 if (!S_ISFIFO(st.st_mode)) {
1600
1601 if (i->force) {
1602 RUN_WITH_UMASK(0000) {
1603 mac_selinux_create_file_prepare(i->path, S_IFIFO);
1604 r = mkfifo_atomic(i->path, i->mode);
1605 mac_selinux_create_file_clear();
1606 }
1607
1608 if (r < 0)
1609 return log_error_errno(r, "Failed to create fifo %s: %m", i->path);
1610 creation = CREATION_FORCE;
1611 } else {
1612 log_warning("\"%s\" already exists and is not a fifo.", i->path);
1613 return 0;
1614 }
1615 } else
1616 creation = CREATION_EXISTING;
1617 } else
1618 creation = CREATION_NORMAL;
1619 log_debug("%s fifo \"%s\".", creation_mode_verb_to_string(creation), i->path);
1620
1621 r = path_set_perms(i, i->path);
1622 if (r < 0)
1623 return r;
1624
1625 break;
1626
1627 case CREATE_SYMLINK: {
1628 RUN_WITH_UMASK(0000)
1629 (void) mkdir_parents_label(i->path, 0755);
1630
1631 mac_selinux_create_file_prepare(i->path, S_IFLNK);
1632 r = symlink(i->argument, i->path);
1633 mac_selinux_create_file_clear();
1634
1635 if (r < 0) {
1636 _cleanup_free_ char *x = NULL;
1637
1638 if (errno != EEXIST)
1639 return log_error_errno(errno, "symlink(%s, %s) failed: %m", i->argument, i->path);
1640
1641 r = readlink_malloc(i->path, &x);
1642 if (r < 0 || !streq(i->argument, x)) {
1643
1644 if (i->force) {
1645 mac_selinux_create_file_prepare(i->path, S_IFLNK);
1646 r = symlink_atomic(i->argument, i->path);
1647 mac_selinux_create_file_clear();
1648
1649 if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
1650 r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL);
1651 if (r < 0)
1652 return log_error_errno(r, "rm -fr %s failed: %m", i->path);
1653
1654 mac_selinux_create_file_prepare(i->path, S_IFLNK);
1655 r = symlink(i->argument, i->path) < 0 ? -errno : 0;
1656 mac_selinux_create_file_clear();
1657 }
1658 if (r < 0)
1659 return log_error_errno(r, "symlink(%s, %s) failed: %m", i->argument, i->path);
1660
1661 creation = CREATION_FORCE;
1662 } else {
1663 log_debug("\"%s\" is not a symlink or does not point to the correct path.", i->path);
1664 return 0;
1665 }
1666 } else
1667 creation = CREATION_EXISTING;
1668 } else
1669
1670 creation = CREATION_NORMAL;
1671 log_debug("%s symlink \"%s\".", creation_mode_verb_to_string(creation), i->path);
1672 break;
1673 }
1674
1675 case CREATE_BLOCK_DEVICE:
1676 case CREATE_CHAR_DEVICE: {
1677 mode_t file_type;
1678
1679 if (have_effective_cap(CAP_MKNOD) == 0) {
1680 /* In a container we lack CAP_MKNOD. We
1681 shouldn't attempt to create the device node in
1682 that case to avoid noise, and we don't support
1683 virtualized devices in containers anyway. */
1684
1685 log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path);
1686 return 0;
1687 }
1688
1689 RUN_WITH_UMASK(0000)
1690 (void) mkdir_parents_label(i->path, 0755);
1691
1692 file_type = i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR;
1693
1694 RUN_WITH_UMASK(0000) {
1695 mac_selinux_create_file_prepare(i->path, file_type);
1696 r = mknod(i->path, i->mode | file_type, i->major_minor);
1697 mac_selinux_create_file_clear();
1698 }
1699
1700 if (r < 0) {
1701 if (errno == EPERM) {
1702 log_debug("We lack permissions, possibly because of cgroup configuration; "
1703 "skipping creation of device node %s.", i->path);
1704 return 0;
1705 }
1706
1707 if (errno != EEXIST)
1708 return log_error_errno(errno, "Failed to create device node %s: %m", i->path);
1709
1710 if (lstat(i->path, &st) < 0)
1711 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1712
1713 if ((st.st_mode & S_IFMT) != file_type) {
1714
1715 if (i->force) {
1716
1717 RUN_WITH_UMASK(0000) {
1718 mac_selinux_create_file_prepare(i->path, file_type);
1719 r = mknod_atomic(i->path, i->mode | file_type, i->major_minor);
1720 mac_selinux_create_file_clear();
1721 }
1722
1723 if (r < 0)
1724 return log_error_errno(r, "Failed to create device node \"%s\": %m", i->path);
1725 creation = CREATION_FORCE;
1726 } else {
1727 log_debug("%s is not a device node.", i->path);
1728 return 0;
1729 }
1730 } else
1731 creation = CREATION_EXISTING;
1732 } else
1733 creation = CREATION_NORMAL;
1734
1735 log_debug("%s %s device node \"%s\" %u:%u.",
1736 creation_mode_verb_to_string(creation),
1737 i->type == CREATE_BLOCK_DEVICE ? "block" : "char",
1738 i->path, major(i->mode), minor(i->mode));
1739
1740 r = path_set_perms(i, i->path);
1741 if (r < 0)
1742 return r;
1743
1744 break;
1745 }
1746
1747 case ADJUST_MODE:
1748 case RELABEL_PATH:
1749 r = glob_item(i, path_set_perms);
1750 if (r < 0)
1751 return r;
1752 break;
1753
1754 case RECURSIVE_RELABEL_PATH:
1755 r = glob_item_recursively(i, fd_set_perms);
1756 if (r < 0)
1757 return r;
1758 break;
1759
1760 case SET_XATTR:
1761 r = glob_item(i, path_set_xattrs);
1762 if (r < 0)
1763 return r;
1764 break;
1765
1766 case RECURSIVE_SET_XATTR:
1767 r = glob_item_recursively(i, fd_set_xattrs);
1768 if (r < 0)
1769 return r;
1770 break;
1771
1772 case SET_ACL:
1773 r = glob_item(i, path_set_acls);
1774 if (r < 0)
1775 return r;
1776 break;
1777
1778 case RECURSIVE_SET_ACL:
1779 r = glob_item_recursively(i, fd_set_acls);
1780 if (r < 0)
1781 return r;
1782 break;
1783
1784 case SET_ATTRIBUTE:
1785 r = glob_item(i, path_set_attribute);
1786 if (r < 0)
1787 return r;
1788 break;
1789
1790 case RECURSIVE_SET_ATTRIBUTE:
1791 r = glob_item_recursively(i, fd_set_attribute);
1792 if (r < 0)
1793 return r;
1794 break;
1795 }
1796
1797 return 0;
1798 }
1799
1800 static int remove_item_instance(Item *i, const char *instance) {
1801 int r;
1802
1803 assert(i);
1804
1805 switch (i->type) {
1806
1807 case REMOVE_PATH:
1808 if (remove(instance) < 0 && errno != ENOENT)
1809 return log_error_errno(errno, "rm(%s): %m", instance);
1810
1811 break;
1812
1813 case TRUNCATE_DIRECTORY:
1814 case RECURSIVE_REMOVE_PATH:
1815 /* FIXME: we probably should use dir_cleanup() here
1816 * instead of rm_rf() so that 'x' is honoured. */
1817 log_debug("rm -rf \"%s\"", instance);
1818 r = rm_rf(instance, (i->type == RECURSIVE_REMOVE_PATH ? REMOVE_ROOT|REMOVE_SUBVOLUME : 0) | REMOVE_PHYSICAL);
1819 if (r < 0 && r != -ENOENT)
1820 return log_error_errno(r, "rm_rf(%s): %m", instance);
1821
1822 break;
1823
1824 default:
1825 assert_not_reached("wut?");
1826 }
1827
1828 return 0;
1829 }
1830
1831 static int remove_item(Item *i) {
1832 assert(i);
1833
1834 log_debug("Running remove action for entry %c %s", (char) i->type, i->path);
1835
1836 switch (i->type) {
1837
1838 case REMOVE_PATH:
1839 case TRUNCATE_DIRECTORY:
1840 case RECURSIVE_REMOVE_PATH:
1841 return glob_item(i, remove_item_instance);
1842
1843 default:
1844 return 0;
1845 }
1846 }
1847
1848 static int clean_item_instance(Item *i, const char* instance) {
1849 _cleanup_closedir_ DIR *d = NULL;
1850 struct stat s, ps;
1851 bool mountpoint;
1852 usec_t cutoff, n;
1853 char timestamp[FORMAT_TIMESTAMP_MAX];
1854
1855 assert(i);
1856
1857 if (!i->age_set)
1858 return 0;
1859
1860 n = now(CLOCK_REALTIME);
1861 if (n < i->age)
1862 return 0;
1863
1864 cutoff = n - i->age;
1865
1866 d = opendir_nomod(instance);
1867 if (!d) {
1868 if (IN_SET(errno, ENOENT, ENOTDIR)) {
1869 log_debug_errno(errno, "Directory \"%s\": %m", instance);
1870 return 0;
1871 }
1872
1873 return log_error_errno(errno, "Failed to open directory %s: %m", instance);
1874 }
1875
1876 if (fstat(dirfd(d), &s) < 0)
1877 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1878
1879 if (!S_ISDIR(s.st_mode)) {
1880 log_error("%s is not a directory.", i->path);
1881 return -ENOTDIR;
1882 }
1883
1884 if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0)
1885 return log_error_errno(errno, "stat(%s/..) failed: %m", i->path);
1886
1887 mountpoint = s.st_dev != ps.st_dev || s.st_ino == ps.st_ino;
1888
1889 log_debug("Cleanup threshold for %s \"%s\" is %s",
1890 mountpoint ? "mount point" : "directory",
1891 instance,
1892 format_timestamp_us(timestamp, sizeof(timestamp), cutoff));
1893
1894 return dir_cleanup(i, instance, d, &s, cutoff, s.st_dev, mountpoint,
1895 MAX_DEPTH, i->keep_first_level);
1896 }
1897
1898 static int clean_item(Item *i) {
1899 assert(i);
1900
1901 log_debug("Running clean action for entry %c %s", (char) i->type, i->path);
1902
1903 switch (i->type) {
1904 case CREATE_DIRECTORY:
1905 case CREATE_SUBVOLUME:
1906 case CREATE_SUBVOLUME_INHERIT_QUOTA:
1907 case CREATE_SUBVOLUME_NEW_QUOTA:
1908 case TRUNCATE_DIRECTORY:
1909 case IGNORE_PATH:
1910 case COPY_FILES:
1911 clean_item_instance(i, i->path);
1912 return 0;
1913 case EMPTY_DIRECTORY:
1914 case IGNORE_DIRECTORY_PATH:
1915 return glob_item(i, clean_item_instance);
1916 default:
1917 return 0;
1918 }
1919 }
1920
1921 static int process_item_array(ItemArray *array);
1922
1923 static int process_item(Item *i) {
1924 int r, q, p, t = 0;
1925 _cleanup_free_ char *prefix = NULL;
1926
1927 assert(i);
1928
1929 if (i->done)
1930 return 0;
1931
1932 i->done = true;
1933
1934 prefix = malloc(strlen(i->path) + 1);
1935 if (!prefix)
1936 return log_oom();
1937
1938 PATH_FOREACH_PREFIX(prefix, i->path) {
1939 ItemArray *j;
1940
1941 j = ordered_hashmap_get(items, prefix);
1942 if (j) {
1943 int s;
1944
1945 s = process_item_array(j);
1946 if (s < 0 && t == 0)
1947 t = s;
1948 }
1949 }
1950
1951 if (chase_symlinks(i->path, NULL, CHASE_NO_AUTOFS, NULL) == -EREMOTE)
1952 return t;
1953
1954 r = arg_create ? create_item(i) : 0;
1955 q = arg_remove ? remove_item(i) : 0;
1956 p = arg_clean ? clean_item(i) : 0;
1957
1958 return t < 0 ? t :
1959 r < 0 ? r :
1960 q < 0 ? q :
1961 p;
1962 }
1963
1964 static int process_item_array(ItemArray *array) {
1965 unsigned n;
1966 int r = 0, k;
1967
1968 assert(array);
1969
1970 for (n = 0; n < array->count; n++) {
1971 k = process_item(array->items + n);
1972 if (k < 0 && r == 0)
1973 r = k;
1974 }
1975
1976 return r;
1977 }
1978
1979 static void item_free_contents(Item *i) {
1980 assert(i);
1981 free(i->path);
1982 free(i->argument);
1983 strv_free(i->xattrs);
1984
1985 #if HAVE_ACL
1986 acl_free(i->acl_access);
1987 acl_free(i->acl_default);
1988 #endif
1989 }
1990
1991 static void item_array_free(ItemArray *a) {
1992 unsigned n;
1993
1994 if (!a)
1995 return;
1996
1997 for (n = 0; n < a->count; n++)
1998 item_free_contents(a->items + n);
1999 free(a->items);
2000 free(a);
2001 }
2002
2003 static int item_compare(const void *a, const void *b) {
2004 const Item *x = a, *y = b;
2005
2006 /* Make sure that the ownership taking item is put first, so
2007 * that we first create the node, and then can adjust it */
2008
2009 if (takes_ownership(x->type) && !takes_ownership(y->type))
2010 return -1;
2011 if (!takes_ownership(x->type) && takes_ownership(y->type))
2012 return 1;
2013
2014 return (int) x->type - (int) y->type;
2015 }
2016
2017 static bool item_compatible(Item *a, Item *b) {
2018 assert(a);
2019 assert(b);
2020 assert(streq(a->path, b->path));
2021
2022 if (takes_ownership(a->type) && takes_ownership(b->type))
2023 /* check if the items are the same */
2024 return streq_ptr(a->argument, b->argument) &&
2025
2026 a->uid_set == b->uid_set &&
2027 a->uid == b->uid &&
2028
2029 a->gid_set == b->gid_set &&
2030 a->gid == b->gid &&
2031
2032 a->mode_set == b->mode_set &&
2033 a->mode == b->mode &&
2034
2035 a->age_set == b->age_set &&
2036 a->age == b->age &&
2037
2038 a->mask_perms == b->mask_perms &&
2039
2040 a->keep_first_level == b->keep_first_level &&
2041
2042 a->major_minor == b->major_minor;
2043
2044 return true;
2045 }
2046
2047 static bool should_include_path(const char *path) {
2048 char **prefix;
2049
2050 STRV_FOREACH(prefix, arg_exclude_prefixes)
2051 if (path_startswith(path, *prefix)) {
2052 log_debug("Entry \"%s\" matches exclude prefix \"%s\", skipping.",
2053 path, *prefix);
2054 return false;
2055 }
2056
2057 STRV_FOREACH(prefix, arg_include_prefixes)
2058 if (path_startswith(path, *prefix)) {
2059 log_debug("Entry \"%s\" matches include prefix \"%s\".", path, *prefix);
2060 return true;
2061 }
2062
2063 /* no matches, so we should include this path only if we
2064 * have no whitelist at all */
2065 if (strv_isempty(arg_include_prefixes))
2066 return true;
2067
2068 log_debug("Entry \"%s\" does not match any include prefix, skipping.", path);
2069 return false;
2070 }
2071
2072 static int specifier_expansion_from_arg(Item *i) {
2073 _cleanup_free_ char *unescaped = NULL, *resolved = NULL;
2074 char **xattr;
2075 int r;
2076
2077 assert(i);
2078
2079 if (i->argument == NULL)
2080 return 0;
2081
2082 switch (i->type) {
2083 case COPY_FILES:
2084 case CREATE_SYMLINK:
2085 case CREATE_FILE:
2086 case TRUNCATE_FILE:
2087 case WRITE_FILE:
2088 r = cunescape(i->argument, 0, &unescaped);
2089 if (r < 0)
2090 return log_error_errno(r, "Failed to unescape parameter to write: %s", i->argument);
2091
2092 r = specifier_printf(unescaped, specifier_table, NULL, &resolved);
2093 if (r < 0)
2094 return r;
2095
2096 free_and_replace(i->argument, resolved);
2097 break;
2098
2099 case SET_XATTR:
2100 case RECURSIVE_SET_XATTR:
2101 assert(i->xattrs);
2102
2103 STRV_FOREACH (xattr, i->xattrs) {
2104 r = specifier_printf(*xattr, specifier_table, NULL, &resolved);
2105 if (r < 0)
2106 return r;
2107
2108 free_and_replace(*xattr, resolved);
2109 }
2110 break;
2111
2112 default:
2113 break;
2114 }
2115 return 0;
2116 }
2117
2118 static int patch_var_run(const char *fname, unsigned line, char **path) {
2119 const char *k;
2120 char *n;
2121
2122 assert(path);
2123 assert(*path);
2124
2125 /* Optionally rewrites lines referencing /var/run/, to use /run/ instead. Why bother? tmpfiles merges lines in
2126 * some cases and detects conflicts in others. If files/directories are specified through two equivalent lines
2127 * this is problematic as neither case will be detected. Ideally we'd detect these cases by resolving symlinks
2128 * early, but that's precisely not what we can do here as this code very likely is running very early on, at a
2129 * time where the paths in question are not available yet, or even more importantly, our own tmpfiles rules
2130 * might create the paths that are intermediary to the listed paths. We can't really cover the generic case,
2131 * but the least we can do is cover the specific case of /var/run vs. /run, as /var/run is a legacy name for
2132 * /run only, and we explicitly document that and require that on systemd systems the former is a symlink to
2133 * the latter. Moreover files below this path are by far the primary usecase for tmpfiles.d/. */
2134
2135 k = path_startswith(*path, "/var/run/");
2136 if (isempty(k)) /* Don't complain about other paths than /var/run, and not about /var/run itself either. */
2137 return 0;
2138
2139 n = strjoin("/run/", k);
2140 if (!n)
2141 return log_oom();
2142
2143 /* Also log about this briefly. We do so at LOG_NOTICE level, as we fixed up the situation automatically, hence
2144 * there's no immediate need for action by the user. However, in the interest of making things less confusing
2145 * to the user, let's still inform the user that these snippets should really be updated. */
2146
2147 log_notice("[%s:%u] Line references path below legacy directory /var/run/, updating %s → %s; please update the tmpfiles.d/ drop-in file accordingly.", fname, line, *path, n);
2148
2149 free(*path);
2150 *path = n;
2151
2152 return 0;
2153 }
2154
2155 static int parse_line(const char *fname, unsigned line, const char *buffer, bool *invalid_config) {
2156
2157 _cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;
2158 _cleanup_(item_free_contents) Item i = {};
2159 ItemArray *existing;
2160 OrderedHashmap *h;
2161 int r, pos;
2162 bool force = false, boot = false;
2163
2164 assert(fname);
2165 assert(line >= 1);
2166 assert(buffer);
2167
2168 r = extract_many_words(
2169 &buffer,
2170 NULL,
2171 EXTRACT_QUOTES,
2172 &action,
2173 &path,
2174 &mode,
2175 &user,
2176 &group,
2177 &age,
2178 NULL);
2179 if (r < 0) {
2180 if (IN_SET(r, -EINVAL, -EBADSLT))
2181 /* invalid quoting and such or an unknown specifier */
2182 *invalid_config = true;
2183 return log_error_errno(r, "[%s:%u] Failed to parse line: %m", fname, line);
2184 } else if (r < 2) {
2185 *invalid_config = true;
2186 log_error("[%s:%u] Syntax error.", fname, line);
2187 return -EIO;
2188 }
2189
2190 if (!isempty(buffer) && !streq(buffer, "-")) {
2191 i.argument = strdup(buffer);
2192 if (!i.argument)
2193 return log_oom();
2194 }
2195
2196 if (isempty(action)) {
2197 *invalid_config = true;
2198 log_error("[%s:%u] Command too short '%s'.", fname, line, action);
2199 return -EINVAL;
2200 }
2201
2202 for (pos = 1; action[pos]; pos++) {
2203 if (action[pos] == '!' && !boot)
2204 boot = true;
2205 else if (action[pos] == '+' && !force)
2206 force = true;
2207 else {
2208 *invalid_config = true;
2209 log_error("[%s:%u] Unknown modifiers in command '%s'",
2210 fname, line, action);
2211 return -EINVAL;
2212 }
2213 }
2214
2215 if (boot && !arg_boot) {
2216 log_debug("Ignoring entry %s \"%s\" because --boot is not specified.",
2217 action, path);
2218 return 0;
2219 }
2220
2221 i.type = action[0];
2222 i.force = force;
2223
2224 r = specifier_printf(path, specifier_table, NULL, &i.path);
2225 if (r == -ENXIO)
2226 return log_unresolvable_specifier(fname, line);
2227 if (r < 0) {
2228 if (IN_SET(r, -EINVAL, -EBADSLT))
2229 *invalid_config = true;
2230 return log_error_errno(r, "[%s:%u] Failed to replace specifiers: %s", fname, line, path);
2231 }
2232
2233 r = patch_var_run(fname, line, &i.path);
2234 if (r < 0)
2235 return r;
2236
2237 switch (i.type) {
2238
2239 case CREATE_DIRECTORY:
2240 case CREATE_SUBVOLUME:
2241 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2242 case CREATE_SUBVOLUME_NEW_QUOTA:
2243 case EMPTY_DIRECTORY:
2244 case TRUNCATE_DIRECTORY:
2245 case CREATE_FIFO:
2246 case IGNORE_PATH:
2247 case IGNORE_DIRECTORY_PATH:
2248 case REMOVE_PATH:
2249 case RECURSIVE_REMOVE_PATH:
2250 case ADJUST_MODE:
2251 case RELABEL_PATH:
2252 case RECURSIVE_RELABEL_PATH:
2253 if (i.argument)
2254 log_warning("[%s:%u] %c lines don't take argument fields, ignoring.", fname, line, i.type);
2255
2256 break;
2257
2258 case CREATE_FILE:
2259 case TRUNCATE_FILE:
2260 break;
2261
2262 case CREATE_SYMLINK:
2263 if (!i.argument) {
2264 i.argument = strappend("/usr/share/factory/", i.path);
2265 if (!i.argument)
2266 return log_oom();
2267 }
2268 break;
2269
2270 case WRITE_FILE:
2271 if (!i.argument) {
2272 *invalid_config = true;
2273 log_error("[%s:%u] Write file requires argument.", fname, line);
2274 return -EBADMSG;
2275 }
2276 break;
2277
2278 case COPY_FILES:
2279 if (!i.argument) {
2280 i.argument = strappend("/usr/share/factory/", i.path);
2281 if (!i.argument)
2282 return log_oom();
2283 } else if (!path_is_absolute(i.argument)) {
2284 *invalid_config = true;
2285 log_error("[%s:%u] Source path is not absolute.", fname, line);
2286 return -EBADMSG;
2287 }
2288
2289 path_kill_slashes(i.argument);
2290 break;
2291
2292 case CREATE_CHAR_DEVICE:
2293 case CREATE_BLOCK_DEVICE: {
2294 unsigned major, minor;
2295
2296 if (!i.argument) {
2297 *invalid_config = true;
2298 log_error("[%s:%u] Device file requires argument.", fname, line);
2299 return -EBADMSG;
2300 }
2301
2302 if (sscanf(i.argument, "%u:%u", &major, &minor) != 2) {
2303 *invalid_config = true;
2304 log_error("[%s:%u] Can't parse device file major/minor '%s'.", fname, line, i.argument);
2305 return -EBADMSG;
2306 }
2307
2308 i.major_minor = makedev(major, minor);
2309 break;
2310 }
2311
2312 case SET_XATTR:
2313 case RECURSIVE_SET_XATTR:
2314 if (!i.argument) {
2315 *invalid_config = true;
2316 log_error("[%s:%u] Set extended attribute requires argument.", fname, line);
2317 return -EBADMSG;
2318 }
2319 r = parse_xattrs_from_arg(&i);
2320 if (r < 0)
2321 return r;
2322 break;
2323
2324 case SET_ACL:
2325 case RECURSIVE_SET_ACL:
2326 if (!i.argument) {
2327 *invalid_config = true;
2328 log_error("[%s:%u] Set ACLs requires argument.", fname, line);
2329 return -EBADMSG;
2330 }
2331 r = parse_acls_from_arg(&i);
2332 if (r < 0)
2333 return r;
2334 break;
2335
2336 case SET_ATTRIBUTE:
2337 case RECURSIVE_SET_ATTRIBUTE:
2338 if (!i.argument) {
2339 *invalid_config = true;
2340 log_error("[%s:%u] Set file attribute requires argument.", fname, line);
2341 return -EBADMSG;
2342 }
2343 r = parse_attribute_from_arg(&i);
2344 if (IN_SET(r, -EINVAL, -EBADSLT))
2345 *invalid_config = true;
2346 if (r < 0)
2347 return r;
2348 break;
2349
2350 default:
2351 log_error("[%s:%u] Unknown command type '%c'.", fname, line, (char) i.type);
2352 *invalid_config = true;
2353 return -EBADMSG;
2354 }
2355
2356 if (!path_is_absolute(i.path)) {
2357 log_error("[%s:%u] Path '%s' not absolute.", fname, line, i.path);
2358 *invalid_config = true;
2359 return -EBADMSG;
2360 }
2361
2362 path_kill_slashes(i.path);
2363
2364 if (!should_include_path(i.path))
2365 return 0;
2366
2367 r = specifier_expansion_from_arg(&i);
2368 if (r == -ENXIO)
2369 return log_unresolvable_specifier(fname, line);
2370 if (r < 0) {
2371 if (IN_SET(r, -EINVAL, -EBADSLT))
2372 *invalid_config = true;
2373 return log_error_errno(r, "[%s:%u] Failed to substitute specifiers in argument: %m",
2374 fname, line);
2375 }
2376
2377 if (arg_root) {
2378 char *p;
2379
2380 p = prefix_root(arg_root, i.path);
2381 if (!p)
2382 return log_oom();
2383
2384 free(i.path);
2385 i.path = p;
2386 }
2387
2388 if (!isempty(user) && !streq(user, "-")) {
2389 const char *u = user;
2390
2391 r = get_user_creds(&u, &i.uid, NULL, NULL, NULL);
2392 if (r < 0) {
2393 *invalid_config = true;
2394 return log_error_errno(r, "[%s:%u] Unknown user '%s'.", fname, line, user);
2395 }
2396
2397 i.uid_set = true;
2398 }
2399
2400 if (!isempty(group) && !streq(group, "-")) {
2401 const char *g = group;
2402
2403 r = get_group_creds(&g, &i.gid);
2404 if (r < 0) {
2405 *invalid_config = true;
2406 log_error("[%s:%u] Unknown group '%s'.", fname, line, group);
2407 return r;
2408 }
2409
2410 i.gid_set = true;
2411 }
2412
2413 if (!isempty(mode) && !streq(mode, "-")) {
2414 const char *mm = mode;
2415 unsigned m;
2416
2417 if (*mm == '~') {
2418 i.mask_perms = true;
2419 mm++;
2420 }
2421
2422 if (parse_mode(mm, &m) < 0) {
2423 *invalid_config = true;
2424 log_error("[%s:%u] Invalid mode '%s'.", fname, line, mode);
2425 return -EBADMSG;
2426 }
2427
2428 i.mode = m;
2429 i.mode_set = true;
2430 } else
2431 i.mode = IN_SET(i.type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA) ? 0755 : 0644;
2432
2433 if (!isempty(age) && !streq(age, "-")) {
2434 const char *a = age;
2435
2436 if (*a == '~') {
2437 i.keep_first_level = true;
2438 a++;
2439 }
2440
2441 if (parse_sec(a, &i.age) < 0) {
2442 *invalid_config = true;
2443 log_error("[%s:%u] Invalid age '%s'.", fname, line, age);
2444 return -EBADMSG;
2445 }
2446
2447 i.age_set = true;
2448 }
2449
2450 h = needs_glob(i.type) ? globs : items;
2451
2452 existing = ordered_hashmap_get(h, i.path);
2453 if (existing) {
2454 unsigned n;
2455
2456 for (n = 0; n < existing->count; n++) {
2457 if (!item_compatible(existing->items + n, &i)) {
2458 log_notice("[%s:%u] Duplicate line for path \"%s\", ignoring.",
2459 fname, line, i.path);
2460 return 0;
2461 }
2462 }
2463 } else {
2464 existing = new0(ItemArray, 1);
2465 if (!existing)
2466 return log_oom();
2467
2468 r = ordered_hashmap_put(h, i.path, existing);
2469 if (r < 0)
2470 return log_oom();
2471 }
2472
2473 if (!GREEDY_REALLOC(existing->items, existing->size, existing->count + 1))
2474 return log_oom();
2475
2476 memcpy(existing->items + existing->count++, &i, sizeof(i));
2477
2478 /* Sort item array, to enforce stable ordering of application */
2479 qsort_safe(existing->items, existing->count, sizeof(Item), item_compare);
2480
2481 zero(i);
2482 return 0;
2483 }
2484
2485 static int cat_config(char **config_dirs, char **args) {
2486 _cleanup_strv_free_ char **files = NULL;
2487 int r;
2488
2489 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, NULL);
2490 if (r < 0)
2491 return r;
2492
2493 return cat_files(NULL, files, 0);
2494 }
2495
2496 static void help(void) {
2497 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
2498 "Creates, deletes and cleans up volatile and temporary files and directories.\n\n"
2499 " -h --help Show this help\n"
2500 " --user Execute user configuration\n"
2501 " --version Show package version\n"
2502 " --cat-config Show configuration files\n"
2503 " --create Create marked files/directories\n"
2504 " --clean Clean up marked directories\n"
2505 " --remove Remove marked files/directories\n"
2506 " --boot Execute actions only safe at boot\n"
2507 " --prefix=PATH Only apply rules with the specified prefix\n"
2508 " --exclude-prefix=PATH Ignore rules with the specified prefix\n"
2509 " --root=PATH Operate on an alternate filesystem root\n"
2510 " --replace=PATH Treat arguments as replacement for PATH\n"
2511 , program_invocation_short_name);
2512 }
2513
2514 static int parse_argv(int argc, char *argv[]) {
2515
2516 enum {
2517 ARG_VERSION = 0x100,
2518 ARG_CAT_CONFIG,
2519 ARG_USER,
2520 ARG_CREATE,
2521 ARG_CLEAN,
2522 ARG_REMOVE,
2523 ARG_BOOT,
2524 ARG_PREFIX,
2525 ARG_EXCLUDE_PREFIX,
2526 ARG_ROOT,
2527 ARG_REPLACE,
2528 };
2529
2530 static const struct option options[] = {
2531 { "help", no_argument, NULL, 'h' },
2532 { "user", no_argument, NULL, ARG_USER },
2533 { "version", no_argument, NULL, ARG_VERSION },
2534 { "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
2535 { "create", no_argument, NULL, ARG_CREATE },
2536 { "clean", no_argument, NULL, ARG_CLEAN },
2537 { "remove", no_argument, NULL, ARG_REMOVE },
2538 { "boot", no_argument, NULL, ARG_BOOT },
2539 { "prefix", required_argument, NULL, ARG_PREFIX },
2540 { "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX },
2541 { "root", required_argument, NULL, ARG_ROOT },
2542 { "replace", required_argument, NULL, ARG_REPLACE },
2543 {}
2544 };
2545
2546 int c, r;
2547
2548 assert(argc >= 0);
2549 assert(argv);
2550
2551 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
2552
2553 switch (c) {
2554
2555 case 'h':
2556 help();
2557 return 0;
2558
2559 case ARG_VERSION:
2560 return version();
2561
2562 case ARG_CAT_CONFIG:
2563 arg_cat_config = true;
2564 break;
2565
2566 case ARG_USER:
2567 arg_user = true;
2568 break;
2569
2570 case ARG_CREATE:
2571 arg_create = true;
2572 break;
2573
2574 case ARG_CLEAN:
2575 arg_clean = true;
2576 break;
2577
2578 case ARG_REMOVE:
2579 arg_remove = true;
2580 break;
2581
2582 case ARG_BOOT:
2583 arg_boot = true;
2584 break;
2585
2586 case ARG_PREFIX:
2587 if (strv_push(&arg_include_prefixes, optarg) < 0)
2588 return log_oom();
2589 break;
2590
2591 case ARG_EXCLUDE_PREFIX:
2592 if (strv_push(&arg_exclude_prefixes, optarg) < 0)
2593 return log_oom();
2594 break;
2595
2596 case ARG_ROOT:
2597 r = parse_path_argument_and_warn(optarg, true, &arg_root);
2598 if (r < 0)
2599 return r;
2600 break;
2601
2602 case ARG_REPLACE:
2603 if (!path_is_absolute(optarg) ||
2604 !endswith(optarg, ".conf")) {
2605 log_error("The argument to --replace= must an absolute path to a config file");
2606 return -EINVAL;
2607 }
2608
2609 arg_replace = optarg;
2610 break;
2611
2612 case '?':
2613 return -EINVAL;
2614
2615 default:
2616 assert_not_reached("Unhandled option");
2617 }
2618
2619 if (!arg_clean && !arg_create && !arg_remove && !arg_cat_config) {
2620 log_error("You need to specify at least one of --clean, --create or --remove.");
2621 return -EINVAL;
2622 }
2623
2624 if (arg_replace && arg_cat_config) {
2625 log_error("Option --replace= is not supported with --cat-config");
2626 return -EINVAL;
2627 }
2628
2629 if (arg_replace && optind >= argc) {
2630 log_error("When --replace= is given, some configuration items must be specified");
2631 return -EINVAL;
2632 }
2633
2634 return 1;
2635 }
2636
2637 static int read_config_file(char **config_dirs, const char *fn, bool ignore_enoent, bool *invalid_config) {
2638 _cleanup_fclose_ FILE *_f = NULL;
2639 FILE *f;
2640 char line[LINE_MAX];
2641 Iterator iterator;
2642 unsigned v = 0;
2643 Item *i;
2644 int r = 0;
2645
2646 assert(fn);
2647
2648 if (streq(fn, "-")) {
2649 log_debug("Reading config from stdin…");
2650 fn = "<stdin>";
2651 f = stdin;
2652 } else {
2653 r = search_and_fopen(fn, "re", arg_root, (const char**) config_dirs, &_f);
2654 if (r < 0) {
2655 if (ignore_enoent && r == -ENOENT) {
2656 log_debug_errno(r, "Failed to open \"%s\", ignoring: %m", fn);
2657 return 0;
2658 }
2659
2660 return log_error_errno(r, "Failed to open '%s': %m", fn);
2661 }
2662 log_debug("Reading config file \"%s\"…", fn);
2663 f = _f;
2664 }
2665
2666 FOREACH_LINE(line, f, break) {
2667 char *l;
2668 int k;
2669 bool invalid_line = false;
2670
2671 v++;
2672
2673 l = strstrip(line);
2674 if (IN_SET(*l, 0, '#'))
2675 continue;
2676
2677 k = parse_line(fn, v, l, &invalid_line);
2678 if (k < 0) {
2679 if (invalid_line)
2680 /* Allow reporting with a special code if the caller requested this */
2681 *invalid_config = true;
2682 else if (r == 0)
2683 /* The first error becomes our return value */
2684 r = k;
2685 }
2686 }
2687
2688 /* we have to determine age parameter for each entry of type X */
2689 ORDERED_HASHMAP_FOREACH(i, globs, iterator) {
2690 Iterator iter;
2691 Item *j, *candidate_item = NULL;
2692
2693 if (i->type != IGNORE_DIRECTORY_PATH)
2694 continue;
2695
2696 ORDERED_HASHMAP_FOREACH(j, items, iter) {
2697 if (!IN_SET(j->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA))
2698 continue;
2699
2700 if (path_equal(j->path, i->path)) {
2701 candidate_item = j;
2702 break;
2703 }
2704
2705 if ((!candidate_item && path_startswith(i->path, j->path)) ||
2706 (candidate_item && path_startswith(j->path, candidate_item->path) && (fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0)))
2707 candidate_item = j;
2708 }
2709
2710 if (candidate_item && candidate_item->age_set) {
2711 i->age = candidate_item->age;
2712 i->age_set = true;
2713 }
2714 }
2715
2716 if (ferror(f)) {
2717 log_error_errno(errno, "Failed to read from file %s: %m", fn);
2718 if (r == 0)
2719 r = -EIO;
2720 }
2721
2722 return r;
2723 }
2724
2725 static int parse_arguments(char **config_dirs, char **args, bool *invalid_config) {
2726 char **arg;
2727 int r;
2728
2729 STRV_FOREACH(arg, args) {
2730 r = read_config_file(config_dirs, *arg, false, invalid_config);
2731 if (r < 0)
2732 return r;
2733 }
2734
2735 return 0;
2736 }
2737
2738 static int read_config_files(char **config_dirs, char **args, bool *invalid_config) {
2739 _cleanup_strv_free_ char **files = NULL;
2740 _cleanup_free_ char *p = NULL;
2741 char **f;
2742 int r;
2743
2744 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, &p);
2745 if (r < 0)
2746 return r;
2747
2748 STRV_FOREACH(f, files)
2749 if (p && path_equal(*f, p)) {
2750 log_debug("Parsing arguments at position \"%s\"…", *f);
2751
2752 r = parse_arguments(config_dirs, args, invalid_config);
2753 if (r < 0)
2754 return r;
2755 } else
2756 /* Just warn, ignore result otherwise.
2757 * read_config_file() has some debug output, so no need to print anything. */
2758 (void) read_config_file(config_dirs, *f, true, invalid_config);
2759
2760 return 0;
2761 }
2762
2763 int main(int argc, char *argv[]) {
2764 int r, k, r_process = 0;
2765 ItemArray *a;
2766 Iterator iterator;
2767 _cleanup_strv_free_ char **config_dirs = NULL;
2768 bool invalid_config = false;
2769
2770 r = parse_argv(argc, argv);
2771 if (r <= 0)
2772 goto finish;
2773
2774 log_set_target(LOG_TARGET_AUTO);
2775 log_parse_environment();
2776 log_open();
2777
2778 if (arg_user) {
2779 r = user_config_paths(&config_dirs);
2780 if (r < 0) {
2781 log_error_errno(r, "Failed to initialize configuration directory list: %m");
2782 goto finish;
2783 }
2784 } else {
2785 config_dirs = strv_split_nulstr(CONF_PATHS_NULSTR("tmpfiles.d"));
2786 if (!config_dirs) {
2787 r = log_oom();
2788 goto finish;
2789 }
2790 }
2791
2792 if (DEBUG_LOGGING) {
2793 _cleanup_free_ char *t = NULL;
2794
2795 t = strv_join(config_dirs, "\n\t");
2796 if (t)
2797 log_debug("Looking for configuration files in (higher priority first):\n\t%s", t);
2798 }
2799
2800 if (arg_cat_config) {
2801 r = cat_config(config_dirs, argv + optind);
2802 goto finish;
2803 }
2804
2805 umask(0022);
2806
2807 mac_selinux_init();
2808
2809 items = ordered_hashmap_new(&string_hash_ops);
2810 globs = ordered_hashmap_new(&string_hash_ops);
2811
2812 if (!items || !globs) {
2813 r = log_oom();
2814 goto finish;
2815 }
2816
2817 /* If command line arguments are specified along with --replace, read all
2818 * configuration files and insert the positional arguments at the specified
2819 * place. Otherwise, if command line arguments are specified, execute just
2820 * them, and finally, without --replace= or any positional arguments, just
2821 * read configuration and execute it.
2822 */
2823 if (arg_replace || optind >= argc)
2824 r = read_config_files(config_dirs, argv + optind, &invalid_config);
2825 else
2826 r = parse_arguments(config_dirs, argv + optind, &invalid_config);
2827 if (r < 0)
2828 goto finish;
2829
2830 /* The non-globbing ones usually create things, hence we apply
2831 * them first */
2832 ORDERED_HASHMAP_FOREACH(a, items, iterator) {
2833 k = process_item_array(a);
2834 if (k < 0 && r_process == 0)
2835 r_process = k;
2836 }
2837
2838 /* The globbing ones usually alter things, hence we apply them
2839 * second. */
2840 ORDERED_HASHMAP_FOREACH(a, globs, iterator) {
2841 k = process_item_array(a);
2842 if (k < 0 && r_process == 0)
2843 r_process = k;
2844 }
2845
2846 finish:
2847 ordered_hashmap_free_with_destructor(items, item_array_free);
2848 ordered_hashmap_free_with_destructor(globs, item_array_free);
2849
2850 free(arg_include_prefixes);
2851 free(arg_exclude_prefixes);
2852 free(arg_root);
2853
2854 set_free_free(unix_sockets);
2855
2856 mac_selinux_finish();
2857
2858 if (r < 0 || ERRNO_IS_RESOURCE(-r_process))
2859 return EXIT_FAILURE;
2860 else if (invalid_config)
2861 return EX_DATAERR;
2862 else if (r_process < 0)
2863 return EX_CANTCREAT;
2864 else
2865 return EXIT_SUCCESS;
2866 }
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